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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e289d061af5f41ecaa12ac96001a1664ef86bad3d4c7cf9519b91a911f20bdd8' 
  AND token = 'snY0oZU9hZ89DrcxGCx4/4e2M1JkT2MxyKJ4L/JIefg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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