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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b90c3426d58b92e22f0acc983d9dfb17b889c4cb9d2bfab2b454dac47f3f6bd' 
  AND token = 'gGdLtogBRfqnhWvblrj5hRmNGP9EGQ1fXvLqclqIea4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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