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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1882d13baec671013a3dce789a5d0a04e5ed7a6fb3840547ba80c03a585022a' 
  AND token = '1ZRmY4UBX8u6hNRdI42mbRNT84hmCez4Oy5HXRpre+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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