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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1140f4280627de5ab005cf4f08fe1f5895c653c30d4f5d1c12e74e6bb6960628' 
  AND token = 'aSSsvraddso0v95evMeWZ3cOZXV4Wq67tch6e2XFDI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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