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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d9d32074b22a6188267919479b9e4b87e72ea538753654b68472141a09bb471' 
  AND token = '6xOb+DeK2nygd9fkpi5kp4NXwkD/4ooiZx57k3s0hK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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