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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e64cd1f0d4a8af90b2d5c093aff9abc58987be2847043e4ac3e4e035ca80b43b' 
  AND token = 'n9LO+aGdcalPeERVrdSA6XUV3iPg4QQbha4B8Q6p474=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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