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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2977d7d56e6a92661bfd531771f1eed9dc3ac4d4ca342ddc71c81491bc0a004d' 
  AND token = 'fcvlVgIqQ2r0SN6sSQGNSO8hLaGz1EKcAeSiO+PNQa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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