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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09e273aa6af100281a42dbd7aad60194fd8ef229e8b280c5560955010414a1ec' 
  AND token = '/qgjlJLJl0ldgThs08t2hYcLMm33cMbXmto5U5HtVyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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