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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54a3b9fc9d01cd3d49b5be11720c123e54a2a6e501abae7dfe30668e6e936acf' 
  AND token = 'dUwVaHKq5ws6YvS2PXEDvu+1yUl9P+nHzDhXiP0Yj5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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