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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73e9e664048eeb52aa3f7e1473c6bd5b7619bf158a5e57bf03f7741ed0e5cd32' 
  AND token = 'bRm5n6gbvTSR7bC7hKROJzrfVe+gvEv+TrDEi9L0iEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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