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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c4fba223a13a76f762bb67fa57928a665619f87eb2b5dbcf301c02f769b79ac' 
  AND token = 'UVOoE/mk2RnUw2bNJ6bHS7MrlDFxRVODBfW+cQA+ZPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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