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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '594322ddb0546042f9e488801a05e03dc88745d68c6f80cf95387e1c0e933111' 
  AND token = 'tiU/j1rIgtYantQh1vUohMrbW8dzQ9Jss46Z/kZ5/t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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