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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e9020ae95e313bc454c83996cea58c7c05e03547ab2498c1e85b74825d93b34' 
  AND token = 'eS+mUKCeFwRzwu6gFkcm/wLyUmB1+xYKTDEXTrkTUC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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