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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e0d7eb6345a02a2813d302aa3ef557267d6237ba26b4ffa2529ad379589665d' 
  AND token = '55tI6A60ZENVA5SBEfXwwnix5x36J13ZGsqZJv0bD0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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