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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e836540b6e46060b4f6456321a50c2855e8b40770bf8479b03d8eec0d4e8abb' 
  AND token = 'txpE7hH3EslBcnDjd3wKUv7GUtiFkRSOunINZSlECDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}