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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '532c8551456d708803ac38eb81120cf4d8358bba06c6b6cccc4d38c1be6b7b15' 
  AND token = 'mDwhpUu60fPhB4WjFRpw66cY2ZitZYa9PvHPJRfPtJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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