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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31acb7db4bfbebd2655527944571397b6f9eee34a579333fe760494c6f1e9651' 
  AND token = 'dKDtAzkx1P7qAA+cjxcMubUZY1FNjqEF2wLP2Rlh35g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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