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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd18b16f877b320c9bb5a5c25745d50e4953ca16d0d1426ab50d1ac5441f29864' 
  AND token = 'nChviF8MSX/zk9uVFP7KFc5WLIxYYyG0ivFAuacaTTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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