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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '894b8c715c6639e175f1bd474d1a177c5d7f1fdfd064cd0b1f8e800dd504cea3' 
  AND token = 'NrG0IWRdVuml+Mzbz0TIBTmDx7wey0CmIOZeas3zwvk=' 
  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"
    }
  }
}