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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd83c93acc86c088ed8e6677ca76385e98a6ed5249fd30153012179f67654c3a1' 
  AND token = 'idZCVoMIsFsbfl8UcYVPfu3SPEyZj7VfARk6WOKJ5oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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