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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bccfd5b84328f654d91d9703a983465cb1ec9e8db6f7061a01d50695950f81d5' 
  AND token = 'X+5iXg9YB18oN6yrYWRIpan3GIquAX1jJIJwwoaJv0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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