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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a56de9608812fc1e212c99298ab97e09718bf8c2876fecd3f8afc789231ceb97' 
  AND token = 'pz9xeh1iB2RJXWXRV5uT/7NrGr4v9BCiBHbotiUJu4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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