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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ddb45fc8da3d562fe6530532ac1c3cd4f55fe6adf1a2ca3eec84a09e9c2e7a7' 
  AND token = 'uI8PUGrGno4W0Hz26sN0cGNoDLjDr2WNl+mxN7zYIzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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