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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa2b94edf6fa9229f72be523bce342b6ce23eb2d7794ebdc7c3aa19517031cc' 
  AND token = 'zkYf4IJtCohdmuLAMt9EsVpCoM5JlATxG2DE9ggF8OI=' 
  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"
    }
  }
}