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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b42e249441c2637c1e47cf4de72a278a62a24329d0571f09c6ad84718b7d0c0f' 
  AND token = 'B3NKPwyU+PfWNd5EzI8CoywO/jW3M2OCpq4gjJhCc4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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