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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac53d090751258329de5d199ca628db34d21ca556881652556775a20c2e001f' 
  AND token = '6UbGg70UG2O8yYgZXC+ilfk0oOKt/PTNkbFdYy4WgT4=' 
  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"
    }
  }
}