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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbbbfec8b7fa8a229a75efa9b005123392be2d2e99f68f78a4f07eee3f6641f6' 
  AND token = 'ipAsWetRccAbmre0Z6bML+ogDO2fZsLhcOl9hwkdtSs=' 
  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"
    }
  }
}