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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ede0ff4fcf9fcf7d69bf8af1af8f9cd7c5262bd8070d4d170957ac4e56774644' 
  AND token = 'sf9zdciPlrjBm91C0kCrMU4LtAw0KWBM0OlhOzotVaY=' 
  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"
    }
  }
}