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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ec31d3fe8d5815b65c1f68107cede47f7b08dea4b3a7a99c834fb7e532ad5fd' 
  AND token = '/uTk6cBW6fLGef9WFFO4QlKr2KtacCDQjP6o2ARn3yQ=' 
  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"
    }
  }
}