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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94cf741c775cc3fbcb77eb8ba50f3ccc0f4c2f57d96424f6360d032ea49c0b7c' 
  AND token = 'm8kLOi2ERfNSHocx1Bbu/gdg9XfCqqNN6sMgsy5J/I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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