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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dd74d93b4f5055b11842ef9621ebfd2a59b1736a3655706afefa60c2399bf98' 
  AND token = 'ErXRZlGn0ZcV4lghU+Oy2wPvWUEhH8yk31o6+H2b2rI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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