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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c56b6e23472d611bdfbb67f660679966f5add601123cf116df6308e2ee471eb' 
  AND token = 'JDYloDqp/O5gqcsXvhdVLm7vuBVhetRB+7bHMApT6lM=' 
  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"
    }
  }
}