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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b14126692e7a5e418748d79e4dd5115674dc9c7c63c94c86c577e06d43c7a86' 
  AND token = 'a5BR9TpBXgTT5gXXa6gHxULjVfwANUM4wz3+QB73HFs=' 
  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"
    }
  }
}