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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd89b7b633ea01f7e5355a41a9863e013a92ff3d5aebabbf3153e1561ebf5510' 
  AND token = 'KN0hLVDn11iknvYKUZ1ULAMb2qVWZrQJD+DdQJENt7w=' 
  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"
    }
  }
}