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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e479c774adef1ef22b7e7402d0cac8989f93e5d1288ccce4e9cdb740e985d7a1' 
  AND token = '/OZwe3N64ZLri9zRXVjGcYcjz2IBpUGzU+bbWitFkJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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