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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33fc45ea71892d30ad2f17d302a31a9222fa2bfa88119164604695b33348c0ff' 
  AND token = 'cMvnmB5GABn7coi6uPTpONOxF6pJ6dY3SjTwSy6iw4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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