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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95e2bd3567f3962415cd3b0b3b96121ff498fe0e1cd51b1c5a11995da17ea0de' 
  AND token = 'eucT0H031CTXgYHhSIW/9pa6YI9r+fl30SsMsQsunoc=' 
  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"
    }
  }
}