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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73571cc6f30312840ac8bfd453453dc26f8b9e0100d7fb537b81b8c5afcf3513' 
  AND token = 'nTijLXTjmWS+OqLpmc1nm2y4vm+7tXm/7GmIYnXWS9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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