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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3bef8cde26174d361cc6e40fffec9a058bd4d2bf1cea1432d9f6caa4e2a6444' 
  AND token = 'ez+0oU21Gr5xo2ahxeEljGKS3u8U8ngvhNCGBTEMvto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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