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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57f93956884d00505337ab69a642ae2092c8fc9f0dec949c295dc9ccc108cdbc' 
  AND token = 'OTF5iO+0Snp1vThI8+q9jtGoj3B2ACY+0XW9tip5QJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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